The angle all depends on who you ask, but a 12:1 bevel is ideal. Overlapping the existing gel after scuffing it by 2-3 inches and alternating between chopped strand and woven roving will result in the best repair for this type of situation.

If you're interested in marine composites I can recommend several book and have one on PDF. Feel free to PM me with your contact info and I will send it to you.

The books that I would recommend for a good basic primer: Fiberglass Boat Design and Construction published by the Society of Naval Architects and Marine Engineers.

More advanced topics: Introduction to composite materials

Hexcel Composites and SP High Modulus also have many great resources on their websites.

Great books! You are correct in rotating between chop and woven, which is why I suggested using something like a 1708 or 3610, which has both in one mat.

The repair is looking great so far! The gel will be pretty tricky to avoid having a halo. I will be interested to see how well it turns out. Where did you end up getting the gel from?